[v8,6/7] PCI: mediatek-gen3: Add system PM support

[Krzysztof Wilczyński]

Hi Jianjun,

> Add suspend_noirq and resume_noirq callback functions to implement
> PM system suspend hooks for MediaTek Gen3 PCIe controller.

So, "systems suspend" and "resume" hooks, correct?

> When system suspend, trigger the PCIe link to L2 state and pull down

It probably would be "the system suspends".

[...]
> When system resum, the PCIe link should be re-established and the
> related control register values should be restored.

Similarly to the above: "the system resumes".

[...]
> +	if (err) {
> +		dev_err(port->dev, "can not enter L2 state\n");
> +		return err;
> +	}

Most likely you want "cannot" or "can't" in the above error message.

> +	/* Pull down the PERST# pin */
> +	val = readl_relaxed(port->base + PCIE_RST_CTRL_REG);
> +	val |= PCIE_PE_RSTB;
> +	writel_relaxed(val, port->base + PCIE_RST_CTRL_REG);
> +
> +	dev_dbg(port->dev, "enter L2 state success");

Just a nitpick.  What about "entered L2 states successfully"?

[...]
> +	if (err) {
> +		dev_err(port->dev, "resume failed\n");
> +		return err;
> +	}

This error message does not quite convey that the mtk_pcie_startup_port()
was the function that failed, which is only a part of what you have to do
to successfully resume.

> +	dev_dbg(port->dev, "resume done\n");

A nitpick.  Probably not needed, as lack of error message would mean
that the device resumed successfully after being suspended.

Krzysztof